package com.ctw.mapmycity.client;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;

public class RestClient {
	
	private static final String baseUrl = "http://192.168.1.5:9090/mmc_server/rest/";
	private static final int TIMEOUT = 10000;
	
	private ArrayList <NameValuePair> params;
    private ArrayList <NameValuePair> headers;

	private String url;

	private int responseCode;
	private String message;

	private String response;

	public String getResponse() {
		return response;
	}

	public String getErrorMessage() {
		return message;
	}

	public int getResponseCode() {
		return responseCode;
	}

	public RestClient(String url) {
		this.url = baseUrl + url;
		params = new ArrayList<NameValuePair>();
		headers = new ArrayList<NameValuePair>();
	}

	public void AddParam(String name, String value) {
		params.add(new BasicNameValuePair(name, value));
	}

	public void AddHeader(String name, String value) {
		headers.add(new BasicNameValuePair(name, value));
	}

	public void Execute(RequestMethod method) throws Exception
	{
		switch(method) {
			case GET:
			{
				//add parameters
				String combinedParams = "";
				if(!params.isEmpty()) {
					combinedParams += "?";
					for(NameValuePair p : params) {
						String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
						
						if(combinedParams.length() > 1)
							combinedParams += "&" + paramString;
						else
							combinedParams += paramString;
					}
				}
	
				HttpGet request = new HttpGet(url + combinedParams);
	
				//add headers
				for(NameValuePair h : headers) {
					request.addHeader(h.getName(), h.getValue());
				}
	
				executeRequest(request, url);
				break;
			}
			case POST:
			{
				HttpPost request = new HttpPost(url);
	
				//add headers
				for(NameValuePair h : headers) {
					request.addHeader(h.getName(), h.getValue());
				}
	
				if(!params.isEmpty()) {
					StringEntity se = new StringEntity(params.get(0).getValue(), "UTF-8"); 
					se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
//					se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
			        
					request.setEntity(se);
				}
	
				executeRequest(request, url);
				break;
			}
		}
	}

	private void executeRequest(HttpUriRequest request, String url) {
		HttpClient client = new DefaultHttpClient();

		HttpResponse httpResponse;
		
		HttpParams params = new BasicHttpParams();
		HttpConnectionParams.setConnectionTimeout(params, TIMEOUT);
	    HttpConnectionParams.setSoTimeout(params, TIMEOUT);
	    request.setParams(params);
		
		try {
			httpResponse = client.execute(request);
			responseCode = httpResponse.getStatusLine().getStatusCode();
			message = httpResponse.getStatusLine().getReasonPhrase();

			HttpEntity entity = httpResponse.getEntity();

			if (entity != null) {

				InputStream instream = entity.getContent();
				response = convertStreamToString(instream);

				// Closing the input stream will trigger connection release
				instream.close();
			}

		} catch (ClientProtocolException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		} catch (IOException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		}
	}

	private static String convertStreamToString(InputStream is) {

		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try {
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}
}